Heat dissipating apparatus

ABSTRACT

A heat dissipating apparatus ( 10 ) includes a plurality of fins ( 20 ) stacked together along a predetermined direction, and a plurality of projection members ( 23 ) extending from each fin. Each of the fins includes a main body ( 22 ). The main bodies of two adjacent fins define an air passage ( 29 ) therebetween. The projection members of a first fin abut against the main body of a second fin, for dividing the air passage into a plurality of small air channels.

DESCRIPTION

1. Field of the Invention

The present invention relates generally to a heat dissipating apparatus, and particularly to a heat dissipating apparatus for a heat generating electronic component.

2. Description of Related Art

Developments in electronic technology have resulted in many heat dissipating problems. A heat dissipating apparatuses is often attached on a heat-generating electronic component to efficiently remove the heat generated by the component.

Conventionally, a heat dissipating apparatus includes a heat sink with a plurality of fins, and a fan for providing airflows passing through the fins. The fins are parallel to and space a predetermined distance with each other. An air passage is formed between two adjacent fins of the heat sink. The airflows pass through the air passages to exchange heat with the fins of the heat sink. The heat is absorbed from the heat-generating component. Then the heat is dissipated to surrounding environment. Thus, heat dissipation of the heat-generating component is accomplished.

In this heat dissipating apparatus, heat-dissipating areas of the heat sink need to be increased to enhance the heat dissipation effect of the heat dissipating apparatus. One way to increase the heat-dissipating areas of the heat sink is to reduce the spacing distance of the adjacent fins. This will increase the weight of the heat sink, which is disadvantageous in view of lightweight requirement of electronic products. Another way is to increase the size of each of the fins. This will increase the size of the heat sink, which is disadvantageous in view of compact requirement of the electronic products. Thus, how to increase the heat dissipating capability of a heat dissipating apparatus without increasing its size and weight becomes an issue.

SUMMARY OF THE INVENTION

The present invention relates to a heat dissipating apparatus. According to a preferred embodiment of the present invention, the heat dissipating apparatus includes a plurality of fins stacked together along a predetermined direction, and a plurality of projection members extending from each fin. Each of the fins includes a main body. The main bodies of two adjacent fins define an air passage therebetween. The projection members of a first fin abut against the main body of a second fin, for dividing the air passage into a plurality of small air channels whereby airflows can more smoothly and quickly flow through the fins to effectively take heat away therefrom.

Other advantages and novel features of the present invention will become more apparent from the following detailed description of preferred embodiment when taken in conjunction with the accompanying drawings, in which:

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an isometric view of a fin assembly according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of a circled portion of FIG. 1 indicated by II;

FIG. 3 is an assembled view of a heat dissipating apparatus constructed with the fin assembly of FIG. 1;

FIG. 4 is an enlarged view of a circled portion of FIG. 3 indicated by IV;

FIG. 5 is an isometric view of a fin assembly according to another embodiment of the present invention;

FIG. 6 is an assembled view of a heat dissipating apparatus constructed with the fin assembly of FIG. 5; and

FIG. 7 is a cross sectional view take along line VII-VII of FIG. 6.

DETAILED DESCRIPTION

Referring to FIGS. 1 to 4, a heat dissipating apparatus 10 according to a preferred embodiment of the present invention includes a plurality of fins 20 stacked together. The fins 20 define a plurality of through holes 21 therein for receiving a plurality of heat pipes 30.

Referring to FIGS. 1 and 2, each of the fins 20 includes a rectangular main body 22. The main body 22 includes a plurality of projection members such as ribs 23 extending from one side of the main body 22, four locking members 24 extending from four corners of the main body 22, and four cutouts 25 corresponding to the locking members 24, respectively.

Each of the ribs 23 is formed by pressing the main body 22 to form an indentation with a “U”-shaped cross section on the main body 22. Each of the ribs 23 includes two sidewalls 26 extending from the main body 22, and a base wall 27 integrally connecting with the sidewalls 26. Alternatively, the cross section of each of the ribs 23 may be triangle-shaped, or hemicycle-shaped.

Each of the locking members 24 includes an abutting plate 24 a perpendicular to the main body 22, a flange 24 b extending from one end of the abutting plate 24 a, and a finger 24 c extending from a free end of the flange 24 b. A longitudinal extension direction of the abutting plate 24 a forms a sharp angle with a top/bottom side 221/222 of the main body 22. The flange 24 b extends along the longitudinal extension direction of the abutting plate 24 a and offsets from the abutting plate 24 a along a lateral direction of the abutting plate 24 a. A slot 28 is defined between the flange 24 b and the main body 22 of the fin 20. A part of the flange 24 b extends beyond a free lateral edge of the abutting plate 24 a. The cutout 25 is defined between the finger 24 c of the locking member 24 and the main body 22.

Referring to FIGS. 3 and 4, in assembly of the heat dissipating apparatus 10, a first fin 20 is held in a vertical direction, and a second fin 20 is placed parallel to the first fin 20, with the ribs 23 of the second fin 20 abutting against the sidewalls 26 of the ribs 23 of the first fin 20. In such position, the free lateral edges of the abutting plates 24 a of the first fin 20 abut against the main body 22 of the second fin 20, thereby defining an air passage 29 between the first fin 20 and the second fin 20. The flanges 24 b of the first fin 20 are received in the slots 28 of the second fin 20, with a lateral edge of each flange 24 b of the first fin 20 abutting against an opposite lateral edge of each flange 24 b of the second fin 20. The fingers 24 c of the first fin 20 extend through the cutouts 25 of the second fin 20, with a front side of each finger 24 c of the first fin 20 aligning with a rear side of the main body 22 of the second fin 20. Then, other fins 20 are sequentially mounted to the second fin 20 in a similar fashion, for stacking the fins 20 in a group. The fingers 24 c of each of the fins 20 are bent to a position that the fingers 24 c of the fins 20 engage the main bodies 22 of corresponding neighboring fins 20. Thus, the fins 20 are connected together to form a fin assembly. Finally, the heat pipes 30 extend through the through holes 21 of the fins 20 and are soldered thereto thereby completing the assembly of the heat dissipating apparatus 10.

In this heat dissipating apparatus 10, the ribs 23 increase heat exchanging areas between the fins 20 and airflows flowing through the air passages 29, thereby increasing the heat dissipation effect of the heat dissipating apparatus 10. The ribs 23 of each of the fins 20 abut against the sidewalls 26 of the ribs 23 of a front fin 20. The interconnected ribs 23 divide the air passages 29 into four fluidically independent air channels (not labeled) through the fin assembly. These air channels are separated from each other. Thus, the airflows passing through the air channels are isolated from each other, thereby preventing turbulence from occurring in the fin assembly. Thus, the airflows can quickly and smoothly flow through the fin assembly to effectively take heat thereaway. This can also increase heat dissipation effect of the heat dissipating apparatus 10.

Referring to FIGS. 5 to 7, a heat dissipating apparatus 10 a according to a second embodiment of the present invention is shown. In this embodiment, the projection members of each fin 20 a are a plurality of air spacing plates 23 a arrayed on the main body 22 a. The air spacing plate 23 a is formed by stamping. The air spacing plate 23 a is perpendicularly projected toward one side of the main body 22 a of the fin 20 a. The air spacing plates 23 a increase heat-dissipating areas of the heat dissipating apparatus 10 a, and divide each of the air passages 29 a into a plurality of small air channels, to increase the heat dissipation effect of the heat dissipating apparatus 10 a.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

1. A heat dissipating apparatus comprising: a plurality of fins stacked together along a predetermined direction, each of the fins comprising a main body, the main bodies of two adjacent fins defining an air passage therebetween; and a plurality of projection members extending from each fin, the projection members of a first fin abutting against the main body of a second fin, for dividing the air passage into a plurality of small air channels.
 2. The heat dissipating apparatus as described in claim 1, wherein the projection members are a plurality of air spacing plates extending from the main body.
 3. The heat dissipating apparatus as described in claim 2, wherein the air spacing plates perpendicularly extend toward one side of the main body.
 4. The heat dissipating apparatus as described in claim 1, wherein the projection members are a plurality of ribs extending from one side of the main body.
 5. The heat dissipating apparatus as described in claim 4, wherein the cross section of each of the ribs is one of “U”-shaped, triangle-shaped and hemicycle-shaped.
 6. The heat dissipating apparatus as described in claim 4, wherein each of the ribs comprises two sidewalls extending from the main body.
 7. The heat dissipating apparatus as described in claim 1, further comprising a plurality of heat pipes extending through the fins.
 8. The heat dissipating apparatus as described in claim 1, wherein the first fin is coupled with the second fin via a plurality of locking members.
 9. The heat dissipating apparatus as described in claim 8, wherein the locking members comprises fingers, respectively, the main body defines a plurality of cutouts between the fingers and the main body, respectively, the fingers of the first fin extend through the cutouts of the main body of the second fin, and engage the main body of the second fin.
 10. The heat dissipating apparatus as described in claim 9, wherein the locking member further comprises an abutting plate extending from the main body, and a flange extending from one end of the abutting plate, the finger offsets from a free edge of the flange.
 11. A heat dissipating apparatus comprising: a plurality of fins, each of the fins comprising a locking member, the locking member being configured for clasping a first fin and a second fin adjacent the first fin to make the fins stacked together; a plurality of air passages formed between the fins, and at least a projection member positioned in each of the air passages for dividing the air passage into a plurality of small air channels.
 12. The heat dissipating apparatus as described in claim 11, wherein each of the fins comprises a main body, the projection members are a plurality of air spacing plate extending from the main body.
 13. The heat dissipating apparatus as described in claim 11, wherein each of the fins comprises a main body, the projection members are a plurality of ribs extending from one side of the main body.
 14. The heat dissipating apparatus as described in claim 11, wherein the locking member comprises a finger, the fingers of the first fin engage a main body of the second fin.
 15. The heat dissipating apparatus as described in claim 14, wherein the locking member further comprises an abutting plate extending from the main body, and a flange extending from one end of the abutting plate, the finger offsets from a free edge of the flange.
 16. A heat dissipating apparatus comprising: a fin assembly comprising a plurality of fins interconnected together, an airflow passage being defined between two neighboring fins, each fin comprising at least a projecting member extending toward a neighboring fin to divide the airflow passage therebetween into at least two fludically independent air channels; and at least a heat pipe extending through the fin assembly.
 17. The heat dissipating apparatus as described in claim 16, wherein the at least a projecting member is a rib having two sidewalls and an end wall interconnecting the two sidewalls.
 18. The heat dissipating apparatus as described in claim 16, wherein the at least a projecting member is a plate perpendicularly projected from a corresponding fin toward a neighboring fin.
 19. The heat dissipating apparatus as described in claim 16, wherein said each fin has a rectangular main body and a locking member formed at a corner of the rectangular main body, the locking member having an abutting plate, a flange extending from a longitudinal end of the abutting plate and offsetting from a lateral free edge of the abutting plate and a finger extending from the flange, the finger being bent to engage with the neighboring fin, and the abutting plate and flange of each fin abut the abutting plate and flange of the neighboring fin in a juxtaposed manner. 